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參數(shù)資料
| 型號(hào)： | CLT3-4BT6 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CURRENT LIMITED OVER-VOLTAGE PROTECTED QUAD DIGITAL TERMINATION |
| 中文描述： | 電流限制過電壓保護(hù)4個(gè)數(shù)字終止 |
| 文件頁(yè)數(shù)： | 3/10頁(yè) |
| 文件大小： | 99K |
| 代理商： | CLT3-4BT6 |
CLT3-4BT6
3/10
TheCLTx-4isaquadrupleinputdigitalterminationdevicedesignedfor24VDCautomationapplications.It
achieves the front-end circuitry of a digital input module (I/O) in industrial automation, and drives an
isolating opto-coupler.
Available in a four channels configuration, it offers a high-density termination by minimizing the external
components count. It is housed in a TSSOP20 surface mount package to reduce the printed board size.
Made of an input voltage protection, a serial current limiting circuit and an opto-coupler driver, each
channel circuit terminates the connection between the logic input and the associated high side sensor or
switch.
The CLT3-4 is a 3 mA quad channel device compatible the type 1 characteristics of the IEC61131-2
standard.
Each input voltage clamping block protects the module input against electromagnetic interferences such
as those described in the IEC61131-2 standard and IEC61000-4-2 (ESD), 4-4 (transient burst), 4-5
(voltage surge) standards. The supply input is also designed with such a protection structure.
The current limiting circuit connected between the input and the output pins is compensated all over the
temperature range. Thanks to its low tolerance, the current limitation allows reducing drastically the
dissipation of the input compared to a resistive input: the overall module requires less cooling capability
and becomes smaller.
The output block of each termination channel controls the operation of an opto-coupler that is enabled by a
Light Emitting Diode.
When the input current is less than 1.5 mA, this output circuit derivates the input current to maintain the
opto-coupler off.
The original structure of the CLT limiter allows its activation threshold to be low and insensitive to the
output voltage up to a maximum value of 2.0 V.
When the CLT input voltage V
IN
is higher than 5 V, or the module input voltage Vi higher than 11 V with the
use of a reverse diode and a serial resistor R
I
= 1.2 k
, the output current that is a share of the input current
(3/4) is higher than 1.5 mA. The whole termination channel including the opto-coupler is on.
FUNCTIONAL DESCRIPTION
Symbol
Pin
Parameter name & conditions
Value
Unit
V
CC
V
C
Supply steady state voltage, R
C
= 0k
Supply steady state voltage, R
C
= 4.7k
Input steady state voltage, R
I
= 0k
Input steady state voltage, R
I
= 1.2k
Input repetitive pulse voltage, R
I
= 1.2k
Input repetitive pulse voltage,
R
I
= 1.2k
, R
C
= 4.7k
(2)
Input maximum forward current,
R
I
= 1.2k
, R
C
= 4.7k
Input maximum reverse current,
R
I
= 1.2k
, R
C
= 4.7k
(2)
Maximum output steady state voltage
- 0.3 to 30
V
- 0.3 to 35
V
V
I(1)
IN
- 0.3 to 30
V
- 0.3 to 32
V
- 0.3 to 35
V
- 30 to 30
V
I
IN
IN
5
mA
20
mA
V
OM
I
OM
T
AMB
T
J
OUT
2.5
V
OUT
Output current
- 4 to 4
mA
AII
Operating ambient temperature
- 25 to 85
°C
Operating and storage junction temperature
- 25 to 150
°C
Note 1:
VI= VIN+ RIx IIN; VIN= voltage at the input pin itself
Note 2:
according to test diagram on figure 8, this case covers especially the reverse polarity operation of one input.
ABSOLUTE RATINGS
(limiting values)
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